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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
The respiratory system consists of a pair of lungs and a trachea through which we draw in air. Air pressure of the atmosphere forces the air inside. For this to happen, the body must lower air pressure inside the chest cavity. It does this by expanding the cavity, using muscles in the rib cage and a special muscle called a diaphragm located under the lungs. When we breathe, the air is first drawn in through the mouth and nose. Moving downward, it goes through the pharynx (or the throat) and through the larynx (or the voice box). From there, it enters the main airway called the trachea. The trachea has rings of cartilage supporting it. The trachea branches off into two bronchi, one for each lung.